Car-brake.



No. 699,346. Patented May 6, I902.

L. T. PYOTT.

CAB BRAKE.

(Application filed Dec. 17, 1900. Renewed Oct. 16, 1901.)

(No Model.) t l.

In a/c ni'ar att No. 699,346. Patented May 6, I902.

L. L FYUTT.

BAR BRAKE.

(Application filed Dec. 1?, 1m Renewed Oct. 16, IOOL) 2 Sheets-Sheet 2Mryzsssa N k: '1 3 g 5 THE uonms min! 110.. PNO'IDLH'Hd" WASHINGTON, 0.c.

Unirnn STATES I PATENT OFFICE.

LOUIS T. PYOTT," OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO JOHN E.REYBURN, ZOF PHILADELPHIA, PENNSYLVANIA.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 699,346, dated May 6,1902.

Application filed December 1'7 1900. Renewed October 16, 1901. SerialNo.78,867. (N model.)

To all whom it may concern:

Be it known that I, LOUIS T. PYOTT, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inCar-Brakes, of which the following is a specification.

My invention relates to improvements in brakes for railway-cars, andmore especially m for street-railway cars, and has for its object theelimination of cross brake-beams,.which owing to the great amount ofspace taken up by motors and other appliances between the wheels rendersit extremely difficult to in- !5 troduce the usual cross brake-beams andto couple them for action. I also provide a system of brake-shoes forthe wheels which insures a quick stop by their immediate gripping whenapplied to the wheels, as the shoes do not crowd the wheels away fromtheir proper working centers or their journals out of their bearings. Ialso provide adouble set of shoes for the wheels and a means to couplethe forward shoes of each wheel to 2 5 each other and the back or rearshoes of each wheel to each other, and I also provide a take-up, wherebyall of the shoes on each side of the truck, and each side of the wheels,are adjusted to proper position for simulta- .30 neous wheel contact,from one central point, plainly in sight, and easily accessible, by thesimple turning of a nut. By employing a double set of shoes I am enabledto prolong their wear, as I present double the wearing- .3 5 surface andalso decrease the wear on the wheel-tread by presenting the shoes upondouble the surface heretofore employed, while also providing for theapplication of more power to stop the wheels and stop them 0 quicker, asthe wheels are not pushed aside by the brake-shoes, but firmly grippedat once. By my means of side couplings for the brake-heads I alsoprovide an additional safeguard for the prevention of persons or objectspassing under the wheels. The brakeshoes as arranged in my system may beapplied or operated by either hand or other power.

Other features than above enumerated will be pointed out in thespecification.

I attain the objects of my invention by the means illustrated in theaccompanying drawings, in Which- Figure 1 is a side elevation of a truckwith my system of brake-shoes applied. Fig. 2 is a half plan or top viewof Fig. 1. Fig. 3 is an enlarged view in elevation of the brake headsand shoes and their operative mechanism more in detail. Fig. 4 is a planor top view of Fig. 3. Fig. 5 is an edge view of the hangers for theouter shoes. Fig. 6 is a modification.

Similar figures of reference indicate similar parts throughout theviews.

There are many forms of trucks now in use on which my system of doublebrake-shoes can be applied with minor modifications of hangings orsuspensions adapted to the different constructions. Therefore I deem thedrawings illustrating my invention as here presented will be asufficient guide for those using trucks to obtain a clear understandingas to the application to other forms and constructions of trucks.

The truck-frame 1 is one of the well-known constructions in present useand has a pair of wheels 2 and apairof wheels 3. To the front of wheels2 are applied brake-heads 4, having removable shoes 5. To the front ofwheels 3 are applied brake-heads 6, having removable shoes 7. Head 4 issuspended by hanger 8o 8, carried by bracket 9, on cross-framing 10, pin11 being inserted through bracket 9 and hanger 8 and pin 12 beinginserted through hanger 8 and head 4. Head 6 is similarly supported bypins 13 14: and hangers 15 to bracket 16, secured to frame 1, and theheads 4: 6 of each side of the truck are secured to each other bylongitudinal bars 17, running between the wheels and frame, (shown as ofT-section,) held by rivets or bolts 18 in head 6 and 19 in head 4., andto insure the heads being correctly adjusted for simultaneous bearing onthe wheels the belts or rivets 19 pass through slotted holes 20, and bar17 is turned inwardly at a right angle and passes 5 across the front ofhead 4: and is provided with an adj Listing-screw 21, having a checknut22 in order to facilitate such adjustment.

To the back of front wheels 2 are applied brake-heads 23, havingremovable shoes 24, I00

the heads being suspended by hangers to brackets 26 on frame 1, pins 27'passing through heads 23 and hangers 25 and pins 28 passing throughhangers 25 and brackets 26. To the back of back wheels 3 are appliedbrake-heads 29, having removable shoes 30 and suspended by hangers 31 tobrackets 32 on cross-framing 33 pins 34 passing through heads 29 andhangers 31 and pins 35 passing through brackets 32 and hangers 31. Toheads 23 29 are secured longitudinal bars 36 at each side of the truckbetween the wheels and frame, the bar being shown as of T-section andrigidly secured to head 23 by bolts or rivets 37 and adjustably to head29 by rivets or bolts 38 in slotted holes 39, while the outer end of bar36 is turned to pass back of head 29 and is provided with anadjustingscrew 40, having acheck-nut 41 to insure simultaneous bearingofthe shoes on the wheels.

It will be seen that the longitudinal bars which connect the brake-headspass outside of the wheels, and thus form a guard as well as a brakeconnection, and that bar 17 is above and clear of bar 36, and that thebars over-reach at the center of the truck. By applying the brake-shoesboth front and back of each wheel the shoes quickly grip the wheel, asthe shoes do not shove the wheel and take up the lost motion ofbearings, boxes, pedestals, &c. before they grip the wheel, but takehold at once and at double the amount of wheel and brake surface of thesystems having one shoe to a Wheel, and therefore reduce both thewheel-tread and brake-shoe wear to a minimum.

The method of applying the brake is by a toggle mechanism, (best seen inFigs. 3, 4,) the means being between each pair of wheels at each side ofthe truck, where a rod 42 is placed vertically, and at its upper end hasthereto attached a lever 43, to which the braking power is attached, thelever being fulcrumed on the frame at any suitable or convenient point.In this instance it is fulcrumed on pin 14 of bracket 16. The rod 42 hasa head 44, to which lever 43 is attached, and below head 44 a cross-head45 is attached, (or it may be formed as a part of rod 42,) and theretoare attached links 46 47 by pins 48 49. Links 46 47 pass downward andare attached to the inner ends of push-bars 5O 51 by pins 52 53, theouter ends of the push-bars being attached to brake-heads 6 23 by pins54 55, so that when rod 42 is pulled up the pushbars are forced up attheir inner ends, and heads 6 23, with their attached shoes, are forcedto the wheels, and by means of the 1on gitudinal connecting-bars 17 36the heads 4 29 are simultaneously moved to the wheels, head 4 beingmoved by head 6 and head 29 being moved by head 23, so that all theheads move in unison to the wheels and grip them at the same time. Ifdesirable and where the motors and other mechanism usually placedbetween the wheels will permit of so doing,

tie-bars may be placed transversely from head tohead or from thelongitudinal conmeeting-bars on one side of the truck to those on theother side.

In order to be sure that all brake-shoes have the same clearance fromthe wheels, so they will take hold of the wheels at the same time, Iintroduce a take-up, which after the end adjustments are made, in thefirst instance by screws 21 40, will thereafter adjust any wear of theshoes, and I do this by placing a block 56 on rod 42 between the innerends of push-bars 52 53, the block having oppositely tapered sides 5758, which bear against the push-bar ends, and by means of a screw-threadon the lower end of rod 42 and a nut 59 and lock-nut 60 the block ismoved up, and its taper takes up the wear on all shoes alike.

In Fig. 5 I show an edge view of hangers 8 31, they being closed at thetop or upper end 61, and legs 62 63 are pierced with holes 64 65 toreceive pins 12 34 and 11 35. With this construction the pins arerelieved from twisting strains, such as are produced when separate linksor hangers are used.

In Fig. 6 I show a modification wherein spring-links are used instead ofthe rigid links 46 47 ,heretofore described. Head 44 is rounded at itstop, and passing over it and attached by screws 66 is a doublespring-lifter 67, passing down at the front and back of rod 42, andlower ends 68 69 are turned to pass over the pins in the jaws ofpush-bars 50 51. By this construction I save many joints and get theadvantage of the automatic return of springlifts 67 to their normalposition after being released from action. Block 56, nut 59, andlock-nut 60 act in the same manner as heretofore described to take upthe shoe wear.

I claim 1. In a brake, a truck-frame, wheels supporting the truck,brakeheads and shoes front and back of each wheel, the front heads of eachwheel, and the back heads of each wheel being attached to longitudinalbars, and all the heads and shoes for each side of the truck beingactuated by toggle mechanism from one point, between the wheels.

2. In a brake, a truck-frame, wheels for the truck, brake heads andshoes at the front of each wheel, longitudinal bars connecting thebrake-heads; brake heads and shoes at the back of eachwheel,longitudinal bars connecting the brake-heads, and toggle meanslocated between the Wheels at each side of the truck to simultaneouslyforce the front and back shoes to the wheels.

3. In a brake, a truck-frame and wheels, brake heads and shoes front andback of each wheel, the front heads of each wheel on each side of thetruck being connected by a longitudinal bar placed outside of thewheels; the back heads on each'wheel on each side of the truck beingconnected by a longitudinal bar, placed outside of the wheels, and meansto operate the front and back heads of each side to simultaneously moveto and press the wheels.

4. In a brake, a truck-frame and wheels, brake heads and shoes at thefront and back of each wheel, the heads and shoes at the front of thewheels, on each side of the truck, being longitudinally connected by abar outside of the wheels, which is rigidly attached to one head and isadjustably attached to the other head; the heads and shoes at the backof the Wheels, on each side of the truck, being longitudinally connectedby a bar outside of the wheels, which is rigidly attached to one headand is adj ustably attached to the other head; and means operative ateach side of the truck to force all of the shoes at that side to thewheels simultaneously.

5. In a brake, a truck-frame and wheels, brake heads and shoes for eachside of each wheel, and toggle means to simultaneously press the frontheads and shoes and the back heads and shoes to the wheels, foroperative center of the truck, and toggle means at each side center ofthe truck having compression members thereto and to the brake-headsbetween the wheels, whereby all the heads and shoes are pressed tocontact with all the wheels, at the same time, by said centrallylocatedtoggle means.

7. In a brake, a truck-frame and wheels, a toggle mechanism at thecenter of each side of the truck, means to connect the toggle mechanismto operate brake heads and shoes at each side of the Wheels, on eachside of the truck simultaneously, and adjusting means on the toggleswhereby the wear on the shoes is taken up by a single operation.

8. In a brake-toggle, a pull-bar, push-bars extending outward andconnected to brakeheads at their outer ends, and at their-inner endsresilient lifting-links connected thereto, reaching therefrom andconnected and attached to the head or upper end of the pull baraforesaid.

9. In a brake, a truck-frame, wheels there for, brake heads and shoesfor the wheels,and hangers for the heads having substantially parallelmembers having means for connections to the brake-head, at theirlowerends, means for connection to a supporting-bracket, and thereafterunited above said bracket supporting point.

In testimony whereof I affix my signature in presence of two witnesses.

LOUIS T. PYOTT;

\Vitnessesi R. O. Wniorrr, YVILLIAM G. STOEVEB.

